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Java example source code file (SystemUtilsTest.java)

This example Java source code file (SystemUtilsTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

constructor, exception, file, freebsd, mac, os/2, reflection, solaris, string, sunos, systemutils, systemutilstest, test, util, windows

The SystemUtilsTest.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.commons.lang3;

import static org.apache.commons.lang3.JavaVersion.JAVA_1_4;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.Locale;

import org.junit.Assert;
import org.junit.Test;

/**
 * Unit tests {@link org.apache.commons.lang3.SystemUtils}.
 * 
 * Only limited testing can be performed.
 */
public class SystemUtilsTest {

    @Test
    public void testConstructor() {
        assertNotNull(new SystemUtils());
        final Constructor<?>[] cons = SystemUtils.class.getDeclaredConstructors();
        assertEquals(1, cons.length);
        assertTrue(Modifier.isPublic(cons[0].getModifiers()));
        assertTrue(Modifier.isPublic(SystemUtils.class.getModifiers()));
        assertFalse(Modifier.isFinal(SystemUtils.class.getModifiers()));
    }

    /**
     * Assums no security manager exists.
     */
    @Test
    public void testGetJavaHome() {
        final File dir = SystemUtils.getJavaHome();
        Assert.assertNotNull(dir);
        Assert.assertTrue(dir.exists());
    }

    /**
     * Assums no security manager exists.
     */
    @Test
    public void testGetJavaIoTmpDir() {
        final File dir = SystemUtils.getJavaIoTmpDir();
        Assert.assertNotNull(dir);
        Assert.assertTrue(dir.exists());
    }

    /**
     * Assums no security manager exists.
     */
    @Test
    public void testGetUserDir() {
        final File dir = SystemUtils.getUserDir();
        Assert.assertNotNull(dir);
        Assert.assertTrue(dir.exists());
    }

    /**
     * Assums no security manager exists.
     */
    @Test
    public void testGetUserHome() {
        final File dir = SystemUtils.getUserHome();
        Assert.assertNotNull(dir);
        Assert.assertTrue(dir.exists());
    }

    @Test
    public void testIS_JAVA() {
        final String javaVersion = System.getProperty("java.version");
        if (javaVersion == null) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.1")) {
            assertTrue(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.2")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertTrue(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.3")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertTrue(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.4")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertTrue(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.5")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertTrue(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.6")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertTrue(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.7")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertTrue(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.8")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertTrue(SystemUtils.IS_JAVA_1_8);
            assertFalse(SystemUtils.IS_JAVA_1_9);
        } else if (javaVersion.startsWith("1.9")) {
            assertFalse(SystemUtils.IS_JAVA_1_1);
            assertFalse(SystemUtils.IS_JAVA_1_2);
            assertFalse(SystemUtils.IS_JAVA_1_3);
            assertFalse(SystemUtils.IS_JAVA_1_4);
            assertFalse(SystemUtils.IS_JAVA_1_5);
            assertFalse(SystemUtils.IS_JAVA_1_6);
            assertFalse(SystemUtils.IS_JAVA_1_7);
            assertFalse(SystemUtils.IS_JAVA_1_8);
            assertTrue(SystemUtils.IS_JAVA_1_9);
        } else {
            System.out.println("Can't test IS_JAVA value: "+javaVersion);
        }
    }

    @Test
    public void testIS_OS() {
        final String osName = System.getProperty("os.name");
        if (osName == null) {
            assertFalse(SystemUtils.IS_OS_WINDOWS);
            assertFalse(SystemUtils.IS_OS_UNIX);
            assertFalse(SystemUtils.IS_OS_SOLARIS);
            assertFalse(SystemUtils.IS_OS_LINUX);
            assertFalse(SystemUtils.IS_OS_MAC_OSX);
        } else if (osName.startsWith("Windows")) {
            assertFalse(SystemUtils.IS_OS_UNIX);
            assertTrue(SystemUtils.IS_OS_WINDOWS);
        } else if (osName.startsWith("Solaris")) {
            assertTrue(SystemUtils.IS_OS_SOLARIS);
            assertTrue(SystemUtils.IS_OS_UNIX);
            assertFalse(SystemUtils.IS_OS_WINDOWS);
        } else if (osName.toLowerCase(Locale.ENGLISH).startsWith("linux")) {
            assertTrue(SystemUtils.IS_OS_LINUX);
            assertTrue(SystemUtils.IS_OS_UNIX);
            assertFalse(SystemUtils.IS_OS_WINDOWS);
        } else if (osName.startsWith("Mac OS X")) {
            assertTrue(SystemUtils.IS_OS_MAC_OSX);
            assertTrue(SystemUtils.IS_OS_UNIX);
            assertFalse(SystemUtils.IS_OS_WINDOWS);
        } else if (osName.startsWith("OS/2")) {
            assertTrue(SystemUtils.IS_OS_OS2);
            assertFalse(SystemUtils.IS_OS_UNIX);
            assertFalse(SystemUtils.IS_OS_WINDOWS);
        } else if (osName.startsWith("SunOS")) {
            assertTrue(SystemUtils.IS_OS_SUN_OS);
            assertTrue(SystemUtils.IS_OS_UNIX);
            assertFalse(SystemUtils.IS_OS_WINDOWS);
        } else if (osName.startsWith("FreeBSD")) {
            assertTrue(SystemUtils.IS_OS_FREE_BSD);
            assertTrue(SystemUtils.IS_OS_UNIX);
            assertFalse(SystemUtils.IS_OS_WINDOWS);
        } else {
            System.out.println("Can't test IS_OS value: " + osName);
        }
    }

    @Test
    public void testIS_zOS() {
        final String osName = System.getProperty("os.name");
        if (osName == null) {
            assertFalse(SystemUtils.IS_OS_ZOS);
        } else if (osName.contains("z/OS")) {
            assertFalse(SystemUtils.IS_OS_WINDOWS);
            assertTrue(SystemUtils.IS_OS_ZOS);
        }
    }

    @Test
    public void testJavaVersionMatches() {
        String javaVersion = null;
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.0";
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.1";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.2";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.3.0";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.3.1";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.4.0";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.4.1";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.4.2";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.5.0";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.6.0";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
        javaVersion = "1.7.0";
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.0"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.1"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.2"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.3"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.4"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.5"));
        assertFalse(SystemUtils.isJavaVersionMatch(javaVersion, "1.6"));
        assertTrue(SystemUtils.isJavaVersionMatch(javaVersion, "1.7"));
    }

    @Test
    public void testOSMatchesName() {
        String osName = null;
        assertFalse(SystemUtils.isOSNameMatch(osName, "Windows"));
        osName = "";
        assertFalse(SystemUtils.isOSNameMatch(osName, "Windows"));
        osName = "Windows 95";
        assertTrue(SystemUtils.isOSNameMatch(osName, "Windows"));
        osName = "Windows NT";
        assertTrue(SystemUtils.isOSNameMatch(osName, "Windows"));
        osName = "OS/2";
        assertFalse(SystemUtils.isOSNameMatch(osName, "Windows"));
    }

    @Test
    public void testOSMatchesNameAndVersion() {
        String osName = null;
        String osVersion = null;
        assertFalse(SystemUtils.isOSMatch(osName, osVersion, "Windows 9", "4.1"));
        osName = "";
        osVersion = "";
        assertFalse(SystemUtils.isOSMatch(osName, osVersion, "Windows 9", "4.1"));
        osName = "Windows 95";
        osVersion = "4.0";
        assertFalse(SystemUtils.isOSMatch(osName, osVersion, "Windows 9", "4.1"));
        osName = "Windows 95";
        osVersion = "4.1";
        assertTrue(SystemUtils.isOSMatch(osName, osVersion, "Windows 9", "4.1"));
        osName = "Windows 98";
        osVersion = "4.1";
        assertTrue(SystemUtils.isOSMatch(osName, osVersion, "Windows 9", "4.1"));
        osName = "Windows NT";
        osVersion = "4.0";
        assertFalse(SystemUtils.isOSMatch(osName, osVersion, "Windows 9", "4.1"));
        osName = "OS/2";
        osVersion = "4.0";
        assertFalse(SystemUtils.isOSMatch(osName, osVersion, "Windows 9", "4.1"));
    }

    @Test
    public void testOsVersionMatches() throws Exception {
        String osVersion = null;
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.1"));

        osVersion = "";
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.1"));

        osVersion = "10";
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.1"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.1.1"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.10"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.10.1"));

        osVersion = "10.1";
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.1"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.1.1"));
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.10"));
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.10.1"));

        osVersion = "10.1.1";
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.1"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.1.1"));
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.10"));
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.10.1"));

        osVersion = "10.10";
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.1"));
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.1.1"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.10"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.10.1"));

        osVersion = "10.10.1";
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.1"));
        assertFalse(SystemUtils.isOSVersionMatch(osVersion, "10.1.1"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.10"));
        assertTrue(SystemUtils.isOSVersionMatch(osVersion, "10.10.1"));
    }

    @Test
    public void testJavaAwtHeadless() {
        final boolean atLeastJava14 = SystemUtils.isJavaVersionAtLeast(JAVA_1_4);
        final String expectedStringValue = System.getProperty("java.awt.headless");
        final String expectedStringValueWithDefault = System.getProperty("java.awt.headless", "false");
        assertNotNull(expectedStringValueWithDefault);
        if (atLeastJava14) {
            final boolean expectedValue = Boolean.valueOf(expectedStringValue).booleanValue();
            if (expectedStringValue != null) {
                assertEquals(expectedStringValue, SystemUtils.JAVA_AWT_HEADLESS);
            }
            assertEquals(expectedValue, SystemUtils.isJavaAwtHeadless());
        } else {
            assertNull(expectedStringValue);
            assertNull(SystemUtils.JAVA_AWT_HEADLESS);
            assertEquals(expectedStringValueWithDefault, "" + SystemUtils.isJavaAwtHeadless());
        }
        assertEquals(expectedStringValueWithDefault, "" + SystemUtils.isJavaAwtHeadless());
    }
}

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